package com.dpj.reentranloock_test;


import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;

import java.util.concurrent.locks.ReentrantLock;

public class TestDeadLock {
    public static void main(String[] args) {
        Chopstick c1=new Chopstick("1");
        Chopstick c2=new Chopstick("2");
        Chopstick c3=new Chopstick("3");
        Chopstick c4=new Chopstick("4");
        Chopstick c5=new Chopstick("5");
        new Philosopher("苏格拉底",c1,c2).start();
        new Philosopher("帕拉图",c2,c3).start();
        new Philosopher("亚里士多德",c3,c4).start();
        new Philosopher("赫拉克利特",c4,c5).start();
        new Philosopher("阿基米德",c5,c1).start();
    }

}


@Slf4j(topic = "c.Philosopher")
class Philosopher extends Thread{
    Chopstick left;
    Chopstick right;
    public Philosopher(String name,Chopstick left,Chopstick right){
        super(name);
        this.left=left;
        this.right=right;
    }

    @SneakyThrows
    @Override
    public void run() {
        while (true){
            //尝试获得左手筷子
            if (left.tryLock()) {
                try{
                    //尝试获得右手筷子
                    if (right.tryLock()) {
                        try{
                            eat();
                        }finally {
                            right.unlock();
                        }
                    }
                }finally {
                    left.unlock();//释放自己手里的筷子
                }

            }
            //尝试获得右手筷子
        }
    }

    private void eat() throws InterruptedException {
        log.debug("eating");
        Thread.sleep(500);
    }
}

class Chopstick extends ReentrantLock {
    String name;

    public Chopstick(String name) {
        this.name = name;
    }

    @Override
    public String toString() {
        return "Chopstick{" +
                "name='" + name + '\'' +
                '}';
    }
}
